title: The role of low-energy electrons in the high-energy radiolysis of condensed CF3I.
abstract: The dynamics of electron-induced reactions in condensed trifluoroiodomethane (CF3I) were studied under ultrahigh vacuum conditions. Seven CF3I radiolysis products (C2F6, C2F5I, C2F3I, CF2I2, C2F4I2, CFI3 and C2F3I3) were identified using temperature-programmed desorption experiments conducted after irradiation with 4 eV electrons. Although C2F6 formation at energies above 4 eV is ascribed to electron-induced electronic excitation followed by prompt dissociation of the C-I bond to form [Formula: see text] radicals that dimerize, the formation of the other six radiolysis products at low sub-ionization incident electron energies is attributed to dissociative electron attachment (DEA) because of the observed resonance peaks in the radiolysis product yields as functions of incident electron energy (∼2 to ∼ 7 eV). All seven CF3I electron-induced reaction products were also identified following irradiation with 500 eV electrons. While dissociative electron attachment and/or electron impact excitation may play an important role in the high-energy radiation-induced synthesis of the high-yield product C2F6, a dramatic enhancement of up to ∼ 2 × 10(4) in product yield per electron at 500 eV relative to that at 4 eV for some products suggests, however, that DEA is not the dominant mechanism for the high-energy radiation-induced synthesis of those products.
authors.affiliation: Department of Chemistry, Wellesley College, Wellesley, MA 02481, USA.
authors.forename: Mahesh
authors.initials: M
authors.lastname: Rajappan
authors.forename: Lin L
authors.initials: LL
authors.lastname: Zhu
authors.forename: Jizhou
authors.initials: J
authors.lastname: Wang
authors.forename: Graeme
authors.initials: G
authors.lastname: Gardner
authors.forename: Kevin
authors.initials: K
authors.lastname: Bu
authors.forename: Huiliang
authors.initials: H
authors.lastname: Mai
authors.forename: Madeleine
authors.initials: M
authors.lastname: Laupheimer
authors.forename: Yomay
authors.initials: Y
authors.lastname: Shyur
authors.forename: Nuriesya S
authors.initials: NS
authors.lastname: Abu Bakar
authors.forename: Samantha K
authors.initials: SK
authors.lastname: Skinner-Hall
authors.forename: Christina
authors.initials: C
authors.lastname: Kim
authors.forename: Jaclyn M
authors.initials: JM
authors.lastname: Haskins
authors.forename: Christopher R
authors.initials: CR
authors.lastname: Arumainayagam